java.lang.RuntimeException: Unable to start activity ComponentInfo{it.unisalento.progetto.software.cunamameli.dafb/it.unisalento.progetto.software.cunamameli.dafb.loginPack.LoginActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process it.unisalento.progetto.software.cunamameli.dafb. Make sure to call FirebaseApp.initializeApp(Context) first. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2456)